Hydrangea (/ha?'dre?nd?i?/;common brands hydrangea or hortensia) is a genus of 70-75 species of flowering crops native to southern and eastern Asia (China, Japan, Korea, the Himalayas, and Indonesia) and the Americas. By far the greatest types diversity is in eastern Asia, china notably, Japan, and Korea. The majority are shrubs 1 to 3 meters high, however, many are small trees, and others lianas reaching up to 30 m (98 feet) by climbing up trees. They can be either evergreen or deciduous, although extensively cultivated temperate types are all deciduous.Having been introduced to the Azores, H. macrophylla is now very common, on Faial particularly, which is known as the "blue island" because of the multitude of hydrangeas present on the island.Life cycleHydrangea plants are created from early spring to late fall; they grow in flowerheads (corymbs or panicles) most often at the ends of the stems.
Typically the flowerheads contain two types of bouquets: small non-showy flowers in the guts or interior of the flowerhead, and large, showy bouquets with large colorful sepals (tepals). These showy blossoms are expanded in a wedding ring often, or to the surface of the tiny flowers. Plants in outdoors populations have few to nothing of the showy bouquets typically, while cultivated hydrangeas have been decided on and bred to have more of the bigger type blooms.There are two flower arrangements in hydrangeas with Corymb style inflorescens, which include the commonly grown "bigleaf hydrangea"--Hydrangea macrophylla. Mophead blossoms are large spherical flowerheads resembling pom-poms or, as the name means, the brain of your mop. On the other hand, lacecap flowers bear round, flat flowerheads with a center core of subdued, small blooms bounded by outer bands of much larger bouquets having showy tepals or sepals.
The blossoms of some rhododendrons and viburnums can appear, at first glance, much like those of some hydrangeas.Colors and soil acidityIn most kinds the plants are white, however in some varieties (notably H. macrophylla), can be blue, red, green, light crimson, or dark purple. In these kinds the colour is afflicted by the occurrence of lightweight aluminum ions which can be found or tangled up depending after the garden soil pH. For H. macrophylla and H. serrata cultivars, the flower color can be dependant on the relative acidity of the soil: an acidic soil (pH below 7), will have available aluminum ions and produce flowers that are blue to purple typically, whereas an alkaline soil (pH above 7) will tie up aluminum ions and bring about pink or red flowers.
This is caused by a color change of the bloom pigments in the presence of aluminium ions that can be taken up into hyperaccumulating crops.[6] Cutting down the pH of potting soils or mixes usually does not change the bloom color to blue, because these soils have no aluminum ions. The ability to blue or green a hydrangea is affected by the cultivar also. Some plants are selected because of their ability to be blued, while others are bred and selected to be red, pink or white. The flower color of most other Hydrangea species is not influenced by aluminum and cannot be changed or shifted. Hydrangeas likewise have a nickname called 'Change Rose'.
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